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In this video, you will learn how to troubleshoot your FiOS Battery Backup Unit or BBU and your
Power Supply Unit or PSU. The Battery Backup Unit and the Power Supply
Unit are required for FiOS services to the Optical Network Terminal or ONT.
Each Battery Backup Unit must have a Power Supply Unit that plugs into an outlet, supplying
power to it. Troubleshooting the PSU:
Each Power Supply Unit has a small green light on it. If it is illuminated, there is power.
If it’s not, there is no power to the PSU. To determine if the PSU is receiving power,
try testing the outlet with a lamp or hair dryer. This can easily determine if the outlet
is working. Troubleshooting the BBU:
Did you notice an intermittent beep coming from the Battery Backup Unit? This means the
BBU needs your attention. Please note – even though there are different
BBU models, the lights on BBUs are basically the same.
To test the battery for possible replacement, first remove the leads connecting to the BBU.
Then unplug the Battery Backup Unit from the AC power outlet. Wait 30 seconds and then
plug it back in to AC power. Wait for the BBU to start beeping, indicating it does not
see battery power. Then replace the battery by firmly re-attaching the leads and placing
in back in the housing unit.